Electric-elevator hoisting mechanism.



N0. 685,325. Patented Oct. '29, I90].

T. W. EATON. ELECTRIC ELEVATOR HOISTING MECHANISM.

(Application filod 1m. 20, 1901.)

6 Sheds-Shut I.

(No Model.)

" illllllllllllf I 'No. 685,326 Patented on. 29, 1901.

T. w. EATON.

ELECTRIC ELEVATOR HOISTING MECHANISM.

. (Application filed In. 26, 1901.) 040mm. 6 Sheets-Sheet 2.

Maw E i -fa THE Nonms PETERS c0. vno'rauwo. WASHINGTON, u. cv

No. 685,326. Patented Oct. 29, I90l. T. W. EATON.

' ELECTRIC ELEVATOR HOISTINGMECHANISM.

(Application fllod in; 26, 1901. (No Model.)

6 Sheets-Sheet 3.

Patented Oct. 29, IBM. T. W. EATON. ELECTRIC ELEVATOR HOISTING MECHANISM.

(Application filed In. 26, 1901.)

6 Shoots-Sheet 4.

(No IodelJ" i w W No. 685,326. Patented Oct. 29, I901. T. w. EA ELECTRIC ELEVATOR H0 6 MECHANISM.

. (Applicatiun filed In. 26, 1901.) oooooo I.) I 6 eeeeeeeeeeee 5.

No. 685,326. Patented Oct 29, I90l. T. W. EATON.

ELECTRIC ELEVATOR HOISTING MECHANISM.

(Application filed Mar. 26, 1901.1 (No Model.) 6 Sheets-Shoot 6.

MYEEEBYE w: NORRKS FTER5 co mom mno. WASHINGTON. o, c.

UNITED STATES PATENT OFFICE.

THOMAS W. EATON, OF CHICAGO, ILLINOIS, ASSIGNOR TO EATON it PRINCE C MPANY, OF CHICAGO, ILLINOIS, A CORPORATION or ILLINOIS;

ELECTRIC-ELEVATOR HOISTING MECHANISM.

SPECIFICATION forming part of Letters Patent No. 685,326, dated October 29, 1901.

Application filed March 26, 1901. Serial No- 531007: (No model.)

To all whom it nuty'conccrn: Fig. 14. is a detail view in section on the line Be itknown that I, THOMAS \V. EATON, a 1414 of Fig. 13. Figs. 15, 16, and 17 are simicitizen of the United States, residing at Chilar views on the lines 15 15, 1 6 16, and 17 1'7, cago, in the county of Cook and State of Illirespectively, of Fig. 13. Fig. 18 is a view in 55 nois, have invented a new and useful Elect-ricdiagram illustrating the electrical action and Elevator-Hoisting Mechanism, of which the operation.

following is a specification. The same part is designated by the same This invention relates to electric-elevator reference-sign whereverit occurs throughout hoisting mechanism. the several views. 60

IO The Object of the invention is to provide Referring to the accompanying drawings, improved means which are simple and efiireference-sign A designates a framework, cient for controlling the hoisting-motor for which may be of any suitable or convenient electric elevators.- construction and arrangement. Suitably The invention consists, substantially,in the journaled in the framework isasl1aftP,which 6 construction, combination, location, and ar- I will hereinafter designate the cam-shaft, rangement, all as will be more fully hereinand upon which are mounted the cams after set forth, as shown in the accompanythrough which the circuit-controlling contacts ing drawings, and finally pointed out in the are operated, as will be more fully described appended claims. hereinafter. Also suitably journaled in the 70 Referring to the accompanying drawings, framework A is a shaft G, adapted to receive and t0 the various views and reference-signs rotation from any suitable sourceas, for inappearing thereon, Figure 1 is a view in elestance, through a worm or other gear H, vation, parts being broken away and showing driven by a convenient rotating part. (Not the main or reversing switch, the automatic shown.) This shaft I will hereinafter desig- 75 :5 stop, and means for controlling the various nate the controller-shaft. Carried by conarmature and field circuits and resistances troller-shaft Gr and adapted to turn freely and auxiliary windings. Fig. 2 is a detail thereon are the main reversing and makeviewin section on the line2 20f Fig. 1looking and-break switches, (indicated at F.) Rotain the direction of the arrows. Fig. 3is a view tion or rocking movement may be imparted 8o similar to Fig. 2 on the line 3 3 of Fig. 1 lookto the switches F in any suitable or coning in the direction of the arrows. Fig. 4 is venient manner, said rocking movements bean end elevation and showing the overload ing controllable from the car. Many speorautoinaticspeedcontrollingsolenoid. Fig. cifically different arrangements may be em- 5 is-abroken detail view of parts cooperating ployed for effecting the proper actuation of 85 with the automatic speed-controlling or overthe main switches F. WVhile,therefore,Ihavc load solenoid. Fig. 6 is a detail view in secshown and will now describe a simple and tion on the line 6 (S of Fig. 7. Fig. 7 is a deconvenient construction for accomplishing tail view in section on the line 7 7 of Fig. 6. this result, I desire it to be understood that Fig. 8 is an enlarged broken detail view in my invention is not to be limited or restricted 9:)

4o elevation of the motor circuit controlling thereto. In the particular form shown a rockmovable contacts. Fig. 9 is a viewin section shaft B is provided and adapted to be rocked on the line 9 9 of Fig. Slooking in the direcin any suitable manner from the car-as, for tion of the arrows. Fig. 10 is asectional plan instance, by suitable connection to crankview .on theline 1O 10, Fig. 9, looking in the arms, (indicated at B,) to which the ordinary 5 direction of the arrows. Fig. 11 is a detached hand cable or lever device on the car may be detail View in section on the line 11 11, Fig. connected in the customary Way. If desired, 12, of the terminal collar. Fig. 12 is a View the brake mechanism (not shown) may also similar to Fig. 11 on the line 12 12 of Fig. 11. be actuated from shaft B in any convenient Fig. 13 is a detached detail view, in side elemanner-as, for instance, through the crank- 100 vation, of the cam-shaft and cams for actuatarms B carried by said shaft. Mounted upon ing the motorcircuit-controlling contacts. to rock with shaft B is a segment-frame (J,

having gear-teeth arranged to mesh with a gear E, suitably connected to the sleeve upon which the main switches F are mounted. In this manner proper actuation of the main switches is effected from the car. If desired, suitable adjusting limiting-stops D may be provided for segment-frame O, and rubber or other spring buffersGO maybe carried by said segment-frame to abut against said limitingstops.

The cam-shaft P may be actuated coincidently with the actuation of the controllershaft G in many different ways. It is desirable, however, to provide means whereby said cam-shaft may be actuated from the controller-shaft. A simple and efficient arrangement for effecting the desired object is shown, wherein a gear Q is mounted upon cam-shaft P and arranged to be engaged by a segmentgear R, carried by one arm of a bell-crank lever S, said lever being pivotally mounted upon a convenient part of the framework and the other arm A thereof engaging a cam-surface T of a frame suitably connected to or forming part of a yoke W, which is connected to or carried by the sleeve upon which the main switches F are carried to rock with such sleeve. If desired, the arm A of the bellcrank lever which engages the cam-surface T may be provided with a suitable weight 0, whereby the tendency of said arm of the bell-crank lever to engage with the cam-surface may be efficiently maintained, and, if desired, and in order to reduce friction the engagement of arm A of the bell-crank lever with the cam-surface T may be through an antifriction-roller D.

The operationof the apparatus so far described is as follows: When it is desired to start up the motor in either direction, the conductor on the car manipulates the hand cable or lever device, thereby effecting a rocking of shaft 13 and through the segment-frame 0, carried by said shaft, imparting the desired rocking movement to the main switches I to complete the motor-circuits. The same movement of the main switches effects a rotary displacement of the camsurface T, and since the weight 0 tends to maintain constant engagement or bearing of the arm A of the bellcrank lever upon the cam-surface T a rocking movement is simultaneously imparted to the rack R, and consequently a rotary movement is imparted to cam-shaft P. The camsurface T is so shaped as to effect a rocking movement of the bell-crank lever in the same direction in whichever direction thecam T is rocked, and therefore in whichever direction the main switches are operated, and when the main switches are returned to central or off position to break the motor-circuits, thereby returning the cam-surface T to central position. The bell-crank lever is also rocked to return cam-shaft P to initial position.

It is desirable that the rotary displacement of cam-shaft P be effected at a uniform speed.

in order that the motor-circuit-controlling movable contacts may be smoothly and evenly actuated. Many different ways for accomplishing this result may be devised. I have shown a simple arrangement wherein I employ a dash-pot 20, in which operates a plunger, upon the stem 21 of which is formed rackteeth arranged to engage a pinion 22, mounted upon shaft P. From this construction it will be seen that when the cam-surface T is rotarily displaced and the weight 0 tends to cause the arm A of the bell-crank lever to follow up such cam-surface the rocking movement of the bell-crank lever is retarded or made uniform through the operation of the dash-pot,as will be readily understood. Thus no matter how rapidly the elevator-conductor may effect a rotary displacement or actuation of the main switches the resulting rotary movement of the cam-shaft P will be effected gradually and at a uniform speed.

It is desirable to provide means for auto matically actuating the main switches F to arrest the motor at the extreme limits of travel of the car. Many specifically different arrangements and constructions for aeeomplishing this result may be employed. I have shown a simple and efficient arrangement, but to which, however, my invention is not to be limited or restricted, wherein I provide the controller-shaft G, or a portion thereof, with screw-threads, as indicated at J. Mounted upon this threaded portion of said shaft is a traveling nut K, having shoulders M, said shoulders arranged to engage corresponding shoulders formed on blocks N, mounted upon to rotate with the controller-shaft G. The blocks N are spaced apart a distance such that the traveling nut K will traverse the space therebetween from one to the other when the car completes the extreme limit of its travel in one direction or the other. Thus when the car reaches the limit of its travel in one direction a shoulder M on nut K thereon will engage a corresponding shoulder upon one of the blocks N, and when the car reaches the limit of its travel in the other direction a similar shoulder on nut K will engage a shoulder on the other of said blocks l. The traveling nut K is normally held against rotation by a loose engagement with a frame or bracket L, suitably weighted in the ordinary manner, and consequently when a shoulder M on said traveling nut engages a shoulder on one or the other of said stops N, the latter being mounted on and rotating with shaft G, the traveling nut K is locked to rotate with the controller-shaft, thereby effecting a rocking movement of the yoke or frame L. 011 yoke L is mounted a stop 23, arranged to operate within a yoke 22%, said yoke being mounted upon to rock with a shaft 25, journaled in the framework. Upon said shaft 25 is mounted a crank-arm 26, connected through a link or red 27 to one of the crank-arms B on shaft 1;). Thus it will be seen that when the operator or con" dulctor on the car effects a rotary movement of shaft B to start up the motor the yoke or frame 24 is simultaneously rocked or swung to one side or the other, according to the clirection of rotary movementimparted to shaft B, and when shaft B is returned to central position yoke 2 f will correspondingly be returned to central position. If, however, the car reaches the limit of its travel without an actuation on the part of the conductor of shaft B to return the same to centered position the yoke 24 will be engaged by roller or projection 23 on bracket or yoke L through the rotation imparted to said yoke or bracket by the traveling nut K engaging a stop-block N, thus effecting a return of the bracket or frame 2% to centered position, and thereby effecting a rocking of shaft 25 and through it and the arms 26 and B and connecting-rod 27 also effecting a rocking movement of shaft B, and consequently the actuation of the main switches F, to break the motor-circuits, at the same time leaving the controller-switches and the operating mechanism therefor free to be moved or actuated to the other direct-ion for starting the car on its return movement toward the opposite limit of its travel.

It is obvious that other forms of mechanism may be devised for effecting an automatic actuation of the main or reversing switches at the extreme limits of travel of the car without departure from the spirit or scope of my invention. I have found, however, that the construction above described is sim ple and efficient for this purpose.

I will now describe the mechanical construction whereby the series fieldqvindings, the armature resistance, and the shunt field resistance are controlled. Upon shaft 1? are mounted sets of cams (indicated generally, see Fig. 13, by reference-sign D D and D Each of these cams comprises a split washer or ring 28, suitably clamped, as indicated at 29, so as to be held in any desired relative rotative adjustment. The set of cams D controls the shunt field resistance-terminals, the set D controls the armature resistanceterminals, and the set D controls the series field-terminals. These washers or rings are preferably formed of rubber, vulcanite, or other similar material to serve as insulation and are cam-shaped on the peripheral surfaces thereof, as clearly shown. On rods 30 are mounted levers 31, an arm of each of said levers being arranged to project out over cam-shaft P and arranged to engage a cam 28 on said shaft. If desired, an antifrictionroller 32 may form the bearing of the arm of said lever upon the peripheralstu'face of the cam. Said arm of the lever may be yieldingly maintained in efficient bearing contact against the cam-surface in any suitable manner. In Fig. 9 I have shown a simple arrangement for accomplishing this result, wherein a spring 33 is arranged to engage a lug 34 on said lever, the tension of said spring being exerted to maintain normal and continuous contact of roller 32 with the cam-surface. The other arm 35 of said lever is arranged to straddle a contact-pin 36, mounted to slide in suitable bearings formed in a bracket or frame 37. Cooperating with each contact-pin 36 is a fixed contact 38, mounted in a socketblock 39, to which are led the terminals of the series field-windings, the armature re sistance, and the shunt field resistance, it being understood that each fixed contact 38 constitutes a terminal of one or the other of these resistances or windings, and a movable contact-pin 36 cooperates with each of the fixed contacts 38, through which the circuit is completed, and consequently by making or breaking contact between the pins 36 and 38 said circuits are made or broken. The end or arm 35 of the contact-actuating lever is arranged to engage a collar &0, mounted upon each contact 36. Each collar 40 is provided with sockets ll to receive the circuit wires 42, each collar 40 being held in proper position upon its contact-pin 36 by set-screw 4:3 or in any suitable manner. A spring 44., fixed at one end upon a lug or extension of the arm 31 of the contact-operating lever is arranged to bear upon collar 40, the tension of said spring normally operating to press said contact-pin toward contacting re lation with respect to the fixed contact 38.

It will be understood that the several cams in each of the sets or groups D D D are so relatively placed with respect to each other as to give the desired timing to the operation and actuation of the contact-pins 36.

From the foregoing description it will be seen that each pair of contacts 36 38 are held separated from each other by a cam on camshaft P; but when said cam-shaft is rotarily displaced to rock the cam-lever the contact 36, supported by said lever, is permitted to approach and make contact with contact-pin 38, the spring 4L4 effecting and insuring such movement or approach. It will also be seen that the connection between the cam-lever and the movable contact is a loose connection, which will permit of a movement of the contact relatively to its supporting-lever, thus guarding against breakage .or injury to the parts in case for any reason an obstruction is encountered which would prevent the dos ing of any pair of contacts. It will also be seen that each pair of contacts is independent of the other contacts in the relative movement of the members thereof. In other words, the movement of each movable con tact 36 toward contact relation with the contact or terminal 38 is wholly under the influence of gravity aided by the tension of spring 4%, the positive rocking of the lev r-arms 31 35 yieldingly effecting the movement of such contact to complete the circuit therethrough. It will also be seen that since the rotation of the cam-shaft P, as above explained, is at aconstant or uniform speed by reason of the dash-pot 20 the completion of the circuits through the several pairs of contacts 36 38 is IIO effected uniformly and at a uniform rate, and it will be seen that the breaking of circuit between said terminals or contacts 36 38 is effected by the actuation of the lever-arms 31 35 under the influence of spring 33 engaging said lever-arms. In the practical operation of an elevator hoisting-motor employing armature resistances and series field coils or windings and shunt field resistances it is desirable in stopping or arresting the motorthat is, as a car approaches a landing at which it is to stopthat the cutting out of the shunt field resistance be effected gradually and that the armature resistance be cut into active circuit before the shunt field resistance is entirely cut out and finally before shutting off or breaking the motor-circuit to reinsert the series field windings in order to secure a proper slowing down of the speed of travel of the car as it approaches the landing at which it is to stop and to place the circuit in proper condition for again starting up. It is an important object and purpose of my invention to secure this relative reinsertion of the series field-windings. This result may be accomplished in many different ways. I have shown a simple arrangement for accomphshing the desired object, wherein instead of mounting the series of cams D which control the series field-terminals, directly upon camshaft P said set or group of cams are mounted on a sleeve 46, which sleeve is mounted to rotate upon cam-shaft P. Connected to said sleeve to rotate therewith is a disk 47, having an elongated slot 48 therein, in which operates a pin or projection 49, carried by pinion Q, which is splined to rot-ate with cam-shaft P. By this construction and relative arrangement the shaft P and its operating-pinion Q are permitted rotation relative to the sleeve 46, which carries the group or set of cams D for a portion, at least, of the rotative movement of said pinion and shaft. In Fig. 6 the parts are shown in the relative positions thereof after the motor-circuits have been broken and with the series field-winding terminals completed ready for the starting up of the motor again, as above set forth. Now when the main switches F are actuated, as above explained, to start up the shaft P is rotated, thereby effecting the rotary displacement of the sets of cams D D, the rotary displacement of the set D being delayed by reason of the pin 40 moving through. slot 48. \Vhen the length of said slot has been traversed by the pin 49, then the sleeve 46 is also rotatively displaced to effect the cutting out of the series field-windings. The motor then will be operating at full speed with the shunt field in circuit, as will be more fully explained hereinafter. lVhen this point is reached, the notch or seat 130 in the periphery of disk 47 will be in position to receive the holder-spring 131, whereby the sleeve 46 is held against accidental rotative displacement in the reverse direction to that above described during the operation of shutting off until the advantage of the delay in the relative movements of the sets of cams has been gainedthat is, until the sets of cams D and D have effected the cutting out of the shunt field resistance and the cutting in of the armature resistance. These operations are effected during the time the slot 48 permits the shaft P to rotate without effecting rotation of sleeve 46, and finally just before shutting off the pin 49 will have reached the end of slot 48 and will effect a rotative displacement of sleeve 46,=and the consequent reinsertion of the series fieldwindings,and the parts will now again occupy the positions shown in Fig. 6.

In the practical operation of elevator hoisting mechanism of the character and arrangement above set forth-that is, where the motor is first started up as a compound-wound machine and is then converted into a shuntwound machineto acquire the desired speed it is desirable to prevent imposing upon the motor a load which would be excessive if the motor were run as a shunt-wound motor. This result may be accomplished in many specifically different ways. I have shown a simple arrangement for accomplishing the desired object which I have found practical and efficient, but to which, however, my invention is not to be limited or restricted. In the particular form shown (see Figs. 4 and 5) I provide a solenoid 50, the coils of which are arranged in series in the motor-armature circuit, and a lever 51, having a hooked end 52, is arranged to be rocked by the actuation of the core 53 of said solenoid. Adjustably mounted upon cam-shaft P is a collar 54, having a lug 55, arranged when lever 5i is rocked to be engaged by the hooked end 52 of said lever to hold or look said shaft P against rotation. If desired, the point at which the core 523 of the solenoid is actuated may be adjustable in any suitable manneras, for instance, by set-screw 5Gand similarly the collar 54 may be mounted for rotative adjustment upon shaft P by means of set-screw 133. In this manner I am enabled to adj ustably regulate the point at which the lever 51 is actuated with reference to the strength of current traversing the coils of said solenoid and also to arrest the rotation of shaft P at any desired point. The operation of this feature of my invention is as follows: Suppose the load upon the car exceeds a safe load for the motor, if the motor were to run shunt-wound. Now when the main switch is actuated to start up the motor as a compound-wound machine and the camshaft P is actuated by the mechanism described to convert the compound-wound motor into a shunt-wound machine the excessive load imposed will demand greater current for the armature, and when such current exceeds the predetermined strength the solenoid-core 53 will be actuated, thereby actuating lever 51 and causing the hook 52 to engage the shoulder 55 on collar 54, and hence locking shaft P against rotation, thus automatically preventing the motor from being converted into a IIO shunt-wound machine, as would be the case if no such provision were made. Consequently the motor will continue to run as a compoundwound machine, with part or all the series field-coils in circuit. By adjusting the position of the solenoid-core 53 or by adjusting the collar 51- on shaft P the apparatus may be set for any desired predetermined load. In this manner I provide an exceedingly simple and ei'licient device forguarding against overloading the motor when run as a shunt-wound machine and for enabling the motor to lift the heavier loads at such lower speed as may be predetermined.

As above indicated, in order to secure the desired overlapping of the cams which control the armature resistance-terminals and of the cams which operate the shunt field resistance said cams are rotatively adjusted upon shaft P to secure the desired results.

I will now explain the electrical operation, particular reference being had to the diagram in Fig. 18, wherein the diagrammatic illustration of the main controller-switches shows such switches in central or 0E position. Reference-signs ab designate the main supply and return wires, respectively. Wire ais led into a fixed contact 0. The dotted lines indicated at 61 62 designate the contact plates or strips on the switch-cylinder, which are respectively placed between contact 0 and contact d, on the one hand, and the contacts 63 64: 65, on the other, and with said contacts 0 and d on the one side and contacts 66, 67, and 68 on the other, as clearly indicated. Upon the switchcylinder are carried transverse contact-strips 69 70, respectively cooperating with the fixed contacts 71 72 and 73 74;. The switch-cylinder also carries the contact plates or strips 75 76 in electrical communication with each other, as shown at 77. The contact strip or plate 75 operates between a contact strip or plate 78 and a series of contacts 79, 80, and 81, while contact-strip 76 operates between said strip or plate 78 and a series of contacts 82, 83, and 84. The main returnwire 17 is in electrical connection with stationary contact strip or plate 78. The contacts 63, 64, and 71 are in electrical connection with each other and also with contacts 83 84, as indicated by reference-sign 85. Contacts and 73 are in electrical connection with each other, as indicated at 86, and also with contact 68, as indicated at 87, and, similarly, contacts 80 and 81 are in electrical connection with each other and with contacts 66 and 67, as indicated at 88. The terminals of the series field-windings and which are controlled by the set or group of cams D on camshaft P are indicated by reference-sign D in Fig. 18. Similarly the armature resistance-terminals areindicated byreferencesign D and the shunt field resistance-tenninals are designated by reference-sign D Now suppose the main switch-cylinder is shifted from the ofif position, as indicated, to on position, so as to cause contact-strip 62 thereon to make contact with the plates or strips 0 d and the contact-strip 61 to make contact with the series of contacts 63 64 65, and contact-strip 76 to make contact with 78, and contact-strip to make contact with 79, 80, and 81. Thereupon the motor-circuit will be completed as follows: Main supply-wire a, contact 0, contact 62, contact (1, wire a, the first terminal of set D thence through all the series field-windings, wire 94:, contact 68, wire 87, contact 65, contact 61, contacts 63 64, wire 85, wire 90, armature resistance D wire 91, solenoid 50, wire 92, armature A wire 93, wire 88, contacts 81, contact 75, wire 77, contact 76, contact 78, to returnwire 5. At the same time the shunt fieldcircuit is completed from the first terminal of the set D through wire 1), bindingpost 105, wire 106, binding-post 107, wire 108, the shunt field-coils of all the field-magnets, Wire 109, binding-post 110, wire 111, wire 112, the shunt fieldresistances controlled by the terminals D at this point in the operation being cut out of circuit, thence to contact 82, connection 83, contact 79, connection 75, connection 77, contactv 76, contact 78, and returnwire Z). Thus the motor starts up with full strength in the shunt field and with all of the series field-coils in live circuit and with the armature resistances all inin other words, as a compound-wound motor. To increase the speed, a continued rotation of the camshaft P, as above described, efiects the desired actuation of the levers which control the terminals of the armature resistance D thereby gradually cutting out this armature resistance. When the armature resistance is partly cut out of circuit, the shunt field resistance D is gradually inserted into working circuit, the cutting out of the armature resistance overlapping the cutting in of the shunt field resistance, although the armature resistance is cut out before the shunt field resistance is entirely inserted into the circuit, this result being effected by the proper relative arrangement of the series or groups D D of cams on cam-shaft P. Now the series field-sections are gradually short-circuited through the operation of the set of cams D In this manner the motor is converted into a shunt-wound with resistance in the shunt field. The reverse of the above operation takes place in stopping. First, the shunt field resistance D is gradually cut out of circuit, the cutting out of such resistance overlapping the gradual insertion or cutting in of the armature resistance D. Finally, just before being shut off the series fie'ldwindings are reinserted, the delay secured by the pin-and-slot connection of the sleeve which carries the series or group of cams D to shaft P permitting of the delay in reinserting the series field-windings until the last,

thus returning the motor to com pound-wound condition.

It will be noted, as above explained, that the coils of solenoid 50 are in series with the armature-circuit, and consequently whenever the load exceeds the safety-point while the motor is running as shunt-wound the solenoid-core will be actuated, thereby looking or arresting the cam-shaft P and causing the motor to run as shunt-wound, with part or all of the series field-coils in circuit, thus automatically controlling the speed of travel of the car and preventing overload as a shuntmotor.

It is believed that the construction and mode of operation above set forth will be fully understood when taken in connection with the accompanying drawings.

While I have described particular constructions and arrangements of apparatus as embodying the best form in which I contemplate carrying my invention into practical operation, I desire it to be understood that my invention is not limited to the exact details of construction and arrangement shown and described; but,

Having now set forth the object and nature of my invention and a construction embodying the principles thereof, what I claim as new and useful and of my own invention, and desire to secure by Letters Patent, is-

1. In an elevator hoisting mechanism, a hoisting-motor having the usual field-magnets and armature, a shunt-winding and auxiliary series coils for the field-magnets, a resistance for the shunt field-windings and a resistance for the armature-circuit, means operating to cut in the shunt field resistance in starting up and for completing the circuit of the series field-windings and for cutting out the armature resistance, said means operating to gradually cut out the armature resistance and to gradually cut in the shunt field resistance before the armature resistance is entirely out out whereby the speed is increased, and means for gradually short-cireuiting the auxiliary series field-windings to convert the motor into a shunt-wound, as and for the purpose set forth.

2. In a hoisting mechanism for electric elevators having the usual armature and field-- magnets, a shunt-winding and auxiliary series coils for the field-magnets, circuits for said armature, windings and coils, a resistance arranged in the shunt field-circuit, a resistance arranged in the armature-circuit,and means whereby, in stopping, the shunt field resistance is gradually cut out of circuit, and means operating to gradually cut in the armature resistance before the shunt field resistance is entirely out out, as and for the purpose set forth.

3. In a hoisting mechanism for electric elevators, a motor having the usual field-magnets and armature, shunt-windings and auxiliary series windings for the fieldmagnets, circuits for said windings and armature, a resistance arranged in the shunt field-circuit, aresistance arranged in the armature-circuit, said auxiliary series field-windings being short-circuited, the armature resistance cut out and the shunt field resistance in circuit when the motor is operating at full speed, and means for gradually cutting out the shuntfield resistance in stop ifing, said means operating to begin the cutting in of the armature resistance before the shunt field resistance is entirely out out of circuit, as and for the purpose set forth.

4. In a hoisting mechanism for electric elevators, a motor having the usual field-magnets and armature, shunt-windings and auxiliary series windings for the field-magnets, circuits for said windings and armature, a resistance arranged in the shunt field-cireuit and a resistance arranged in the armaturecircuit, said shunt field resistance being inserted, the armature resistance out of circuit and the auxiliary series fieldwindings being short-cireuited when the motor is operating at full speed, in combination with means for gradually cutting out the shunt field resistance, and means for gradually cutting in the armature resistance before the shunt field resistance is all out and means for finally reinserting the series field-coils whereby the motor is arrested and during the arrest thereof is converted from a shunt-wouml to a compound-wound motor, as and for the purpose set forth.

5. In an apparatus of the class described, a hoisting-motor,circuits therefor, movable contacts for controlling said circuits, a rock-arm for actuating each of said contacts, cams for rocking said arms, and means for controlling said cams, as and for the purpose set forth.

6. In an apparatus of the class described, a hoisting-motor, circuits therefor, means for controlling said circuits including movable contacts, means normally acting to yieldingly maintain said contacts in closed relation, a rock-arm normally operating to separate said contacts, and means for controlling the move ments of said rock-arm, as and for the purpose set forth.

7. In an apparatus ofthe class described, a movable contact and a cooperating stationary contact, a spring normally operating to maintain said contacts in closed relation, a lever arranged to engage said movable contact, a spring engaging said lever and operating to hold the same in position to maintain said contacts separated, and means for rocking said lever, as and for the purpose set forth.

8. In an apparatus of the class described, a movable contact and a cooperating stationary contact, a collar carriedby said movable con tact, a spring operating to normally maintain said contacts in closed relation, a rock-lever arranged to engage said movable contact in open relation, a spring operating upon said lever, and a cam arranged to engage said lever to rock the same against the action of its holding-spring to permit said in ovable contact to move into closed relation, as and for the purpose set forth.

9. In an apparatus of the class described, a series of movable contacts and a cooperating series of stationary contacts, means normally operating to maintain each of said movable contacts in closed relation with respect to its cooperating stationary contact, an arm for each movable contact, a spring arranged to engage each arm whereby said arms are held in position to maintain said movable contacts out of closed relation, and means for positively rocking said arms, as and for the purpose set forth.

10. In an apparatus of the class described, a series of movable contacts, a rock-shaft having a series of cams thereon corresponding to said movable contacts, means normally operating to yieldingly maintain said contacts in closed relation, levers arranged to form a support for said contacts, means normally acting to maintain said lovers in engagement with said cams, whereby when said cam-shaft is rocked said contacts are moved to open position or permitted to move into closed position, and means for controlling said camshaft, as and for the purpose set forth.

11. In an apparatus of the class described, a hoisting-motor, circuits therefor including a shunt field-circuit and an armature-circuit, resistances arranged in each of said circuits, movable contacts arranged to control said resistances, means for moving said contacts including a cam-shaft having a cam for each of said contacts, said cams being so relatively arranged as to cause said armature resistances to be gradually cutout and said shunt field resistances to be cut in, the cutting in of the shunt field resistances beginning before the armature resistances are cut out, as and for the purpose set forth.

12. In an apparatus of the class described, a hoisting-motor having circuits, an armaturecircuit and a shunt field-circuit, resistances in each of said circuits, movable contacts for controlling said resistances, a cam-shaft having cams thereon, devices actuated by said cams for controlling the movements of said movable contacts, said cams being so relatively arranged as to permit the cutting in or out of the armature resistance in advance of the final cutting out or in of the shunt field resistance, as and for the purpose set forth.

13. In an apparatus of the class described, a hoisting motor having an armature, shunt field and series field circuits, resistances arranged in said shunt field and armature circuits, movable contacts for controlling all of said circuits and means for actuating said contacts, and means whereby the actuation of the cont-acts which control said series fieldcircuits is delayed with reference to the actuation of the contacts which control said armature and shunt field circuits, as and for the purpose set forth.

14:. In an apparatus of the class described, a hoisting-motor, circuits therefor including an armature, shunt field and auxiliary series field circuits, movable contacts for control: ling each of said circuits, actuating devices for said contacts, including a camshaft, cams mounted on said shaft for operating said armature and shunt field circuits, controlling contacts, other cams also mounted on said cam-shaft for movement relative thereto for operating the contacts which control said series field-circuits, and means for actuating said cam-shaft, as and for the purpose set forth.

15. In an apparatus of the class described, a hoisting-motor having an armature, shunt field and series field circuits, means for controlling said circuits including a cam-shaft, cams mounted on to rock with said shaft for controlling said armature and shunt field circuits, a sleeve mounted on said shaft and carrying cams arranged to control said series field-circuits, and a pin-and-slot connection between said sleeve and shaft, as and for the purpose set forth.

16. In an apparatus of the class described, a hoisting-motor, circuits therefor, means for controlling said circuits, including movable contacts, a cam-shaft, a pinion for rocking the same, cams mounted on said shaft to rock therewith, a sleeve mounted on said shaft, other cams mounted on said sleeve, a disk connected to said sleeve and having an elongated slot therethrough, a pin or projection carried by said pinion and operating in said elongated slot, and devices actuated by said cams for controlling said circuits, as and for the purpose set forth.

17. In an apparatus of the class described, a hoisting-motor, circuits therefor, means for controlling said circuits, including a rockshaft, means for rocking said shaft, a pinion mounted on said shaft, a rack arranged to engage said pinion, a dash-pot in which said rack operates whereby the movement of said shaft is rendered uniform, as and for the purpose set forth.

18. In an apparatus of the class described, a hoisting-motor having circuits, controlling devices for said circuits, including movable contacts, acam-shaft, devices actuated thereby for controlling the opening and closing of said contacts, an operating-gear mounted on said shaft, a rock-lever having a rack arranged to engage said gear, means for rock ing said lever, and a dash-pot geared to said shaft for rendering the movements of the same regular and uniform, as and for the purpose set forth.

19. In an apparatus of the class described, a motor and circuits therefor, movable contacts for controlling said circuits, a cam-shaft having cams, devices actuated by said cams for permitting the opening and closing of said contacts, an operating-gear mounted on said cam-shaft, a weighted rock -lever having a rack arranged to engage said gear to actuate said shaft, means for rocking said weighted lever, said means being controllable from the car, as and for the purpose set forth.

20. In an apparatus of the class described, a hoisting-motor,circuits therefo runovable con facts for controlling said circuits, a cam-shaft,

devices actuated thereby for controlling the opening and closing of said contacts, a pinion mounted on said shaft, a rock-lever having a segment-rack arranged to engage said pinion, a main controller-shaft, a cam mounted thereon arranged to engage said rock-lever to actuate the same, and means controllable from the car for actuating said main controllershaft, as and for the purpose set forth.

21. In an apparatus of the class described, a hoisting-motor,circnits therefor, movable con facts for controlling said circuits, a cam-shaft for controlling the opening and closing of said contacts, a pinion mounted on said shaft, a rock-shaft having a segment-rack arranged to engage said pinion, a main controller-shaft, a cam mounted thereon, said lever arranged to engage said cam, and a weight carried by said lever for tending to maintain constant engagement of said lever and cam, as and for the purpose set forth.

22. In an apparatus of the class described, a hoisting-motor,circuits therefor,movable contacts for controlling said circuits, a cam-shaft, means actuated thereby for controlling the opening and closing of said contacts, a pinion carried by said shaft, a rock-lever having a segment-rack arranged to engage said pinion, a main controller-shaft,a cam carried thereby, a Weight for maintaining the lever in contact with said cam, and a dash-pot geared to said cam-shaft, as and for the purpose set forth.

23. In an apparatus of the class described, a hoisting-motor, circuits therefor, means for controlling said circuits, including a camshaft, means for rocking said shaft, including a rock-lever, a main controller-shaft, a cam mounted thereon, said lever arranged to engage said cam, devices controllable from the car for actuating said controller-shaft,and means for automatically rocking said shaft at the extreme limits of travel of the car, as and for the purpose set forth.

24. In an apparatus of the class described, a hoisting-motor having armature, series, field and shunt circuits, terminal contacts for 0011- trolling the resistance in the armature-circuit, a second set of terminals for controlling the resistance in the shunt field-circuit, and a third set of terminals for controlling the series field-windings, means for actuating said several sets of terminals, and means for looking the terminals which control the series field-windings during a portion of the movement of the other sets of terminals, as and for the purpose set forth.

25. In an apparatus of the class described, a motor having armature, shunt field and series field circuits, terminal contacts for controlling said circuits, a shaft having cams mounted thereon for actuating the terminal contacts of the motor-armature and shunt field circuits, a sleeve mounted on said shaft and carrying cams for controlling the series field-terminal contacts, a disk connected to said sleeve and having an elongated slot ceases therein, a pin connected to said shaft and operating in said slot whereby said shaft may move during a portion of its rotation without effecting a rotation of said sleeve, and means for locking said sleeve against displacement during such relative movement, as and for the purpose set forth.

26. In an apparatus of the class described, a motor having armature, shunt field and series field circuits, terminal contacts for controlling said circuits, a shaft having cams mounted thereon for actuating the terminal contacts of the motor-armature and shunt field circuits, a sleeve mounted on said shaft and carrying cams for controlling the series field-terminal contacts,adisk connected to said sleeve and having an elongated slot therein, a pin connected to said shaft and operating in said slot, said disk also provided with a notch or seat in the periphery thereof, and a spring arranged to engage said notch or seat, as and for the purpose set forth.

27. In an apparatus of the class described, a motor, means for starting up said motor as a compound-wound machine, means for converting said motor into a shunt-wound machine, and means for automatically preventing the conversion of the motor into a shuntwound machine in case of overload, as and for the purpose set forth.

28. In an apparatus of the class described, a motor, circuits therefor, means for controlling said circuits whereby when the motor starts up it is a compounl'l-wound machine, said circuit-controlling means operating to convert said motor into a shunt-wound machine, and means for automatically locking said circuit-controlling means in case of overload, as and for the purpose set forth.

29. In an apparatus of the class described, a motor, circuits therefor, means for controlling the circuits of said motor including camshafts, in combination with means for locking said cam-shaft in case of an overload, as and for the purpose set forth.

30. In an apparatus of the class described, a motor, circuits therefor, controlling devices for said circuits, a solenoid arranged in the armature-circuit to be actuated when the current exceeds a given strength, and means actuated by said solenoid for locking said cir cult-controlling devices, as and for the purpose set forth.

31. In an apparatus of the class described,a motor, circuits therefor, controlling devices for said circuits, a solenoid arranged in the armature-circuit to be actuated when the current attainsapredetermined strength, means for adjusting the point at which said solenoid is actuated, and means actuated by said solenoid for locking said circuit-controlling devices, as and for the purpose set forth.

In an apparatus of the class described, a motor, circuits therefor, controlling devices for said circuits includinga rock-shaft, a solenoid arranged in the armature-circuit, and

esasz means actuated by said solenoid for automatically locking said shaft, as and for the purpose set forth.

33. In an apparatus of the class described, a motor, circuits therefor, controlling devices for said circuits, said controlling devices operating in starting up to convert said motor from a compoundwound machine into a shunt-wound machine, a solenoid arranged in the motor-circuit and adapted to be actuated when the current traversing the coils thereof exceeds a predetermined strength, and devices actuated by said solenoid for locking said circuit, controlling means to prevent the motor from being converted into a shunt-wound machine in case of overload, as and for the purpose set forth.

34. In an apparatus of the class described, a

motor, circuits therefor, controlling devices for said circuits including a rock-shaft, a collar adjustably mounted on said shaft,- a hook lever arranged to cooperate with said collar to lock said shaft against rotation in one direction, and a solenoid arranged in the motorcircuit to be actuated when the current at tains a predetermined strength for moving said hook-lever into cooperative relation with respect to said collar, as and for the purpose set forth.

In witness whereof I have hereunto set my hand, this 22d day of March, 1901, in the pres ence of the subscribing witnesses.

THOMAS W. EATONA Witnesses:

E. O. SEMPLE, S. E. DABBYt 

